Outpainting, extend the canvas horizontally to 16:9 widescreen aspect ratio. Keep the central image completely locked and unchanged. Dynamically extend the sides of the frame. The scene is a continuation of a group of menacing juvenile delinquents cornering someone in a narrow city alleyway from a Korean manhwa comic. On the left and right sides, extend the vertical concrete and brick walls of the dark, gritty alleyway, adding shadows and realistic urban perspective. Maintain the ground asphalt texture below. High-contrast monochrome black and white manga ink style, clean manga line-art, deep blacks, sharp screentone texturing on the background walls, dramatic overhead lighting.
